#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>

int main()
{
  printf("USER: %s\n", getenv("USER"));
  printf("HOME: %s\n", getenv("HOME"));
  printf("PWD: %s\n", getenv("PWD"));
  printf("PATH: %s\n", getenv("PATH"));


  return 0;
}

